U.S. Route 30 in Oregon

U.S. Route 30 (US 30) in the U.S. state of Oregon is a major east–west United States Numbered Highway that runs from its western terminus in Astoria to the Idaho border east of Ontario. West of Portland, US 30 generally follows the southern shore of the Columbia River; east of Portland, the highway has largely been replaced with Interstate 84 (I-84), though it is signed all the way across the state, and diverges from the I-84 mainline in several towns as a de facto business route. (The state of Oregon does not sign Interstate business routes; instead, it uses the designations US 30 and Oregon Route 99 [OR 99; along the I-5 corridor] for this purpose.) At 477.02 miles (767.69 km), it is also the longest road in the state.

Route description

Astoria to Portland

US 30 begins in Astoria, at an intersection with US 101. US 101 southbound from the intersection goes down the length of the Oregon Coast while northbound US 101 crosses the Astoria–Megler Bridge into Washington. US 30 proceeds east through the intersection, through downtown Astoria, and then along the southern bank of the Columbia River.

East of Astoria, US 30 is known as the Lower Columbia River Highway No. 2W, a designation which it carries until Portland.

Between Astoria and Portland, the highway passes through (or by) numerous Columbia River towns, such as Svensen, Knappa, Wauna, and Westport. In Westport, one can use the Wahkiakum County ferry to cross the Columbia River to Puget Island and Cathlamet, Washington.